<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>css布局2</title>
<link href="css6.css" rel="stylesheet" type="text/css">
</head>

<body>
	<h2>作业1</h2>
<div class="box1">
<div class="item1">1111</div>
<div class="item2">1111</div>
<div class="item3">1111</div>
	</div>
	<h2>作业2</h2>
<div class="box2">
<div class="son">
<div class="item4">1111</div>
<div class="item5">1111</div>
<div class="item6">1111</div>
	</div>		
</div>
	<h2>作业3</h2>
<div class="box3">
<div class="son1">
<div class="item7">1111</div>
<div class="item8">1111</div>
<div class="item9">1111</div>
	</div>		
</div>
</body>
</html>
